Cheese Day falls on November 20th. It is the celebration of all things having to do with cheese. A party invitation consists of nought more than a verbal request to "come over, and bring something cheesy!". This can be a movie from the 80s, Wallace and Grommit's "A Grand Day Out" (featuring a moon made of green cheese!), Doritos, quesadillas, or the board game Mouse Trap. It is the host's responsibility to make the grilled cheese, and the host's decision as to the methods and materials.
Cheese Day (Observed) is the third Saturday in November, and because it falls on a Saturday, there is almost no reason not to have a party. Unlock your door, call up all your friends, pop in a cheesy movie, and let hijinks ensue...
Behold the power of cheese!